Drill shaper and sharpener.



PATENTED FEB. 3, 1903.

I. RETALLAGK. DRILL SHAPER AND SHARPENER.

APPLIOATIO PILED JULY 3 1902.

2 SHEETB-SEEBT 1.

NO MODEL.

. V/////////////////////%///A/ /////fl//fl// V//// %V/ V// UNITED STATES PATENT OFFICE.,

JOSEPH RETALLACK, OF VICTOR, COLORADO, ASSIGNOR OF ONE-HALF TO A. TREVARTHEN, OF COLORADO SPRINGS, COLORADO.

DRLL SHAPER AND SHARPENER.

SPECIFICATION formng part of Letters Patent No. 719374, dated February 3, 1903.

Application filed July 3. 1902. Serial No. 114.284. (No model.)

Tr ctl whom it' may concrn:

Be it known that I, JosEPH RETALLACK, a citizenof the United States, residing at Victor, in thecounty of Teller and State of Colorado, have invented a new and useful Drill Shaper and Sharpener, of which the following is a specification.

My invention is an improved machine for shaping and finishing drills after the same have been forged and for sharpening the edges of the drills; and it consists in the peculiar Construction and combination of devices hereinafter fully set forth and claimed.

One object of my invention is to efiect improvements in the means for clamping a drill and holding the same while being dollied.

A further object of my invention is to provide improved means for cutting off the burs formed When the drill is shaped by the coacting clamping dies and dolly.

A further object of my invention is to provide the clamping-dies and bur-cutters with coacting means for guiding the bur-cutters.

A further object of my invention is to provide improved means for operatin g the clam ping-dies and bur-cutters, respectively.

A further object of my invention is to provide improved means for centering a drill in the head and to adapt the machine for finishing and sharpening drills of various sizes.

A further object of my invention is to provide a machine of the class described having a fixed support for the outer end of a drill shank or stock and a longitudinally-movable head, whereby the machine is adapted for use in shaping and sharpening d-illswhich vary in length.

4 In the accompanying drawings, Figure l is partly an elevation and partly a vertical longitudinal central sectional view of a drill shaping and sharpening machine embodying my improvements. Fig. 2 is a topplan view of the same. Fig. 3 is a vertical transverse sectional view taken on a plane indicated by the line a a of Fig. 1. Fig. 4 is a detail sectional View takenfon a plane indicated by the line Z) b of Fig. 3 with the covering-plate 3& in position. Fig. 5 is a detail perspective view of one of the clamping-dies.` Fig. 6 is a similar View of one of the radially-movable Fig. 7 is a detail View showing bur-cutters.

" size. i

the dolly detachably connected to the pistenrod of a fluid-pressure apparatus by a key. Fig. Sis a detail elevation showing the aircylinders which operate the chuck-rings that 5 5 actuate the clamping-dies and bur-cutte's.

In the embodiment of my invention shown in the drawings I provide a supporting table or bed 1, which is provided on its upper side with side fianges 2, that form guides for a 6o longitudinally-movable carriage 3. A rack 4 is disposed centrally on the upper side of the bed, and the same is engaged by a pinion 5 on a shaft 6, which has its bearings in the car-iage near one end, which I will term the inner end thereof. At one end of the said shaft isa hand-wheel 7, by means of which the shaft and the pinion may be rotated, so that the pinion and rack will coact to move the carriage longitudinally on the bed. The carriage has a head 8, provided with an opening 9, through which a drill a may eXtend. At one end of the bed is a head block or standard 10. The same is gained transversely on its inneside near its upper end, as at 11, and in the said gain is fitted the base 12 of a block 13, which block has an opening 14, adapted to receive the outer end of the drill-stock to form a supporting-socket therefor, and has a projecting shoulder 15 under the said opening to bear under the outer portion of the drill-stock. The carriage 3 is provided with a pair of brackets 16, which bear against the inner side of the head 8 and serve to brace the said head. A shaft 17 has its bearings in the said brackets. The said shaft hasa crank 18 at one end by which it may be turned, and on the said shaft, in line with the opening 9, is a drill-support 19,which has a plurality of supporting sides or faces 20,' forming its periphery, which supporting sides or faces vary in distance from the center of the shaft 17. Hence the said drill-support may by tnrning the shaft be appropriately disposed to support a drill in the required horizontal position and centrally in the opening 9, irrespective of the size of the drill dianetrically, and hence the machine is adapted for operation on drills which vary in IOO The head 8 is provided on` its outer side with a projection -21 of cylindrical form and the periphe'ry of which is concentric with the opening 9. The said projectionc is provided with guide-grooves 22, which radiate from the said opening. In the said guide-grooves are disposed a series of radially-movable clamping dies 23, which have their inner ends shaped to conforn to the shape of the drill, as at 24. The said clamping-dies are provided at their outer ends with projecting arms 25, on the inner sides of which are tappets 26. The said clamping-dies are further formed with guide fianges or tongues 27 on their outer sides. The depth of the guide-grooves 22 exceeds that of the clamping-dies, and on the outer sides of the clamping-dies are radially-movable bur-cutters 28, which are also guided in the guide-grooves 22 and are provided on their inner sides with grooves 29, which are engaged by the flanges or tongues 27 of the clamping-dies, so that the bur-cutters are guided on the said clamping-dies. The said bur-cutters are formed with arms 30, which project from their front sides at their outer ends, and on the inner sides of the said arms are tappets 31. A pair of chuckrings 32 33 are revoluble on the projection 21, being held thereon bya circular plate 34, which is secured to the outer end of the projection by screws or bolts 35 or other suitable devices, and the said chuck-rings are respectively provided on their inner sides with tangentially-disposed cam-grooves 36 37, which are engaged by the tappets of the clampingdies and bnr-cutters,respectively. Hence by partly revolving the said ch uck-rings the clamping-dies and bur-cutters may be moved radially either toward or from the center of the opening 9, as will be understood. The chuck-ring 32 has an Operating-arm 38, and the chuck-ring 33 is provided with a similar Operating-arm 39'.

A pair of vertically-disposed guideways 40 41 are carried, respectively, by the head 8 on carriage 3, which travels therewith, and are disposed beyond one side of the bed or table l. A cross-head 42 operates vertically in the said guideways and is connected to the piston-rod 43 of an air-cylinder 44, which aircylinder is supported by a longitudinally-disposed guide 45, that is below and to one side of the bed or table l and is seoured to the supports 46 of the bed or table. The said cylinder is movable longitudinally with the heads and carriage. The arm 38 of the chuckring 32 is connected to the cross-head by a link or pitman 47. Hence the said chuck-ring may be operated by the air-cylinder and piston therein, which constitute a fiuid-pressure mechanism, as will be understood.

The carriage 3 is provided with a bed 48, adapted to support the cylinder of a compressed-air drill of the usual construction, and the said bed is provided with a 'guideway' 49. The dolly 50, which is employed to shape and finish the edges of the drill, is disposed to operate longitudinally in the guide 49 and is provided at its outer end with a suitable key or other device by means of which it may be detachably connected to the pistonrod of the compressed-air drill, so that the dolly may be operated by the compressedair drill, as may be understood, and in coaction with the clamp-dies, hereinbefore described, and which securely clamp the drill in place, shape and finish and sharpen the drill, as will be understood. The dolly strikes repeated blows upon the end of the drill in shaping, finishing, and sharpening the same, and burs are formed by the action of the dolly at the outer edges of the drill, which burs are removed by the bur-cutters. The latter may be operated by partly tu rning the chuck-ring 33 by means of its arm 39. This arm is connected by a link 51 to a cross-head 52, that operates in guideways 53, and is connected to the piston-rod 54 of an air-cylinder 55, that is disposed alongside the cylinder 44 and is novable longitudinally therewith and with the heads and carriage. The said air-oylinders are secured to the respective guideways and are provided with rollers 56 57, respectively, that operate on the guide 45, which forms a track-rail.

It will be understood that the dolly as Well as the dies may be of any desired size and Construction, and the same being removable 'by providing suitable dies and dollies the machine may be employed for shaping and sharpening various kinds and sizes of drills.

In operation the carriage 3, with its related parts, is first adjusted upon the bed or frame of the machine in such a position as toenable the shank ofthe drill that is to be operated upon to be adjusted in the socket 14, the weight of the drill being supported upon the projecting shoulder 15 below said sooket. The carriage is then moved in the direction of the drill to a position at which the eX- treme front end of said drill shall be in a line With the clamping-dies 23, and the auxiliary supporting device 19, which, as described, is provided with a plurality of faces at Varying distances from its aXis, is now adjusted so as to support the drill at an intermediate point. Air is now admitted to the cylinder 44, so as to actuate the chuck-ring 32, whereby the clamping-dies 23 are moved inwardly to engage the four sides of the drill, which is thereby held in position with absolute security. The air-pressure may be permitted to continue while the dolly is in operation, or the chuck-ring may, if preferred, be temporarily retained in position with the dies clamping the drill by any suitable mechanical means. While the drill is thus held against lateral or vertical displacement (its rear end being supported against longitudinal displacement by the supporting means at the end of the bed of the machine) air is admitted to the oylinder 48, the piston-rod of which is connected With the dolly, as hereinbefore described. This cylinder 48 is preferably provided with an automatic valve-gear, generally indicated 'at 75, but which constitutes no part of my IOO IIO

present invention, the function thereof being simply to provide for the automatic reversal of the valve controlling the adnission and exhaust of air at the proper points, so as to cause a succession of blows to be rapidly delivered until the air-supply is cut off. In this manner the working face of the drill is properly shaped, as will be readily understood; but at the same time a portion` of metal will accumulate in the form of burs at the edge of each of the cntting-flanges of the drill. To remove these burs,.it is only necessary to actuate the chuck-ring 33, which is done by means of air admitted into the cylinder 55 to force the piston of the lat-ter in an upward direction, thus through the intermediate connections imparting a rotary movement to said chuck-ring, whereby the burcutlers are moved radially in an inward direction, engaging the cutting edges of the drill-fianges and removingany accu mulations of metal from the edges thereof. It is obvions that the tools which constitte the burcutters are to be provided with V-shaped recesses to engage the cutting edges of the drill, and these recesses, which have been designated 29, also serve to engage the guideridges 27 upon the clamping-dies, as has been hereinbefore described. As soon as the burcutters have performed their function, they are withdrawn by reversing the valve of the air-cylinder 55, so as to cause the reverse movement of the piston and piston-rod as well as of the parts operated thereby. The chuckring 32 is finally operated to release the clam ping-dies, this being effected either by releasing the mechanical means whereby the said chuck-ring may be temporarily held or by reversing the air-valve of the cylinder 44, so as to cause a reverse movement of the pisten therein or both in the event of mechanical retaining neans being employed as merely auxiliary to the air-pressure. The carriage may then be moved forwardly from the bed sufficiently to release the drill, which may now be removed and 'another on'e be placed in position for operation. i

It will be understood that inasmuch as the air-cylinders, which are employed toactuate the clamping-dies, the bur-cutters, and .the dolly, are connected with the carriage and travel with the latter upon the bed of the machine fiexi ble means will be needed forconveying the air or fluid under pressure to said cylinders. Such means, however, have not been shown in the drawings, as they do not form a part of my invention, and will be readily understood. it necessary to illustrate the detailecl construction of the cylinders, inasmnch as these features are no part of the present invention and arewell understood by mechanics familiar with this class of devices.

Having thus described my invention, I claiml. In a machine of the class described, a

Neither have I deemed set of movable clamping-dies and a set of independently-movable trimming-tools guided upon said clamping-dies.

2. In a machine of the class described, a set of radially-movable clamping-dies and a set of independently-movable tri m ming-tools guided upon said clamping-dies, andindependent Operating means for said clampingdies and trimming-tools.

3. In a machine of the class described, a set of radially-movable clamping-dies having V-shaped ridges in combination With inde-` pendently movable trim ming tools guided upon said clamping-dies and having V-shaped recesses engaging the ridges thereof and also engaging the edges of the tool that is being operated upon.

r 4:. In a machine of the class described, a bed, fixed supporting means thereon to receive and hold against end thrust the shank of the drill, a carriage movable upon the bed, adjustable auXiliary drill-supporting means upon said carriage, and radially movable trinming-tools and Operating mechanism for the same mounted upon said carriage.

5. In a machine of the class described, a bed, fixed supporting means thereon to receive and hold against end thrust the shank of the drill, a carriage movable upon the bed and adjustable With relation to the drill, a head upon said carriage havinga cylindrical projection and an axial perforation, the latter in aXial alinement with the drill-supporting means upon the head-block of the bed, radial grooves in the cylindrical projection of the head-block of the carriage, holding-dies and trimming tools radially movable in said grooves adjacent to and independently of each other, and means for independently operating said holding-dies and trimming-tools.

6. In a machine of the class described, a bed, fixed supporting means thereon to receive and hold against end thrust the shank of the drill, a carriage movable upon the bed and adjustable with relation to the drill, adjustable auxiliary drill supporting means upon said carriage, a head on said carriage having a cylindrical projection, radially grooved, and an axial perforation, holdingdies and trimming-tools independently movable in said radial grooves, and fluid-pressureoperated means including chuck-rings, aircylinders connected and travelingwith the carriage and connecting means for Operating the said holding-dies and trimming-tools.

7. In a machine of the class described, a bed, fixed supporting means the'eon to receive and hold against end thrust the shank of the drill, a carriage movable upon the bed, a head upon said carrage havinga cylindrical projection, radially grooved, and an axial perforation, holding-dies novable in said radial grooves and having V-shaped ridges, trimming-tools movable in said radial grooves adjacent to and independently of the holdingdies and having V-shaped recesses engaging IOO o lying-tool longitudinally movable upon said earriage, and fluid-pressure means for operating the dolly supported upon and movable with the oarriage.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in 1 the presence of two witnesses.

J OSEPH RE'FALLACK. VVitnesses:

GEORGE TREVARTHEN, G. W. BATHEY. 

